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GeezerVison is showing github.com — [3.14] gh-109638: Fix exponential time in csv.Sniffer for doubled quotes (GH-154868) by serhiy-storchaka · Pull Request #155112 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Aug 3, 2026

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Manual backport of #154868 (commit d52184b).

Lib/csv.py applied cleanly. The conflict in Lib/test/test_csv.py was only in the surrounding context: the 3.15 file has tests from other PRs which are not backported, so only the five tests added by GH-154868 were taken.

  • Issue: csv.Sniffer regular expression has significant backtracing #109638

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@serhiy-storchaka
[3.14] pythongh-109638: Fix exponential time in csv.Sniffer for doubl…
9411ba2 
…ed quotes (pythonGH-154868)

(cherry picked from commit d52184b)
This was referenced Aug 3, 2026
csv.Sniffer regular expression has significant backtracing #109638
Closed
[3.15] gh-109638: Fix exponential time in csv.Sniffer for doubled quotes #154868
Merged
@bedevere-app bedevere-app Bot added the awaiting core review label Aug 3, 2026
@serhiy-storchaka
serhiy-storchaka merged commit ca87a0a into python:3.14 Aug 3, 2026
50 of 53 checks passed

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@bedevere-app bedevere-app Bot removed the awaiting core review label Aug 3, 2026
@serhiy-storchaka
serhiy-storchaka deleted the backport-3.14-gh109638 branch August 3, 2026 11:47
@serhiy-storchaka serhiy-storchaka added the type-security A security issue label Aug 3, 2026
deadlovelll pushed a commit to deadlovelll/cpython that referenced this pull request Aug 5, 2026
@serhiy-storchaka @deadlovelll
[3.14] pythongh-109638: Fix exponential time in csv.Sniffer for doubl…
599560c 
…ed quotes (pythonGH-154868) (pythonGH-155112)

(cherry picked from commit d52184b)
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@serhiy-storchaka
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